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Old   November 14, 2005, 05:38
Default too bad convergence
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Hi everybody, I'm in trouble with a finite difference code to resolve a Poisson equation in a channel.

I have a 3D problem with Neumann condition in one direction and the others are periodic.

In regular mesh, it works perfectly but as soon as I use an stretched mesh ( even very very smooth ), my SOR ( or other relaxtion method ) converge on large residual ( about 0.1 ).

I have no idea how to get a good convergence.

Thanks for your help.
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Old   November 17, 2005, 14:30
Default Re: too bad convergence
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Have you seen this?

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Old   November 20, 2005, 06:08
Default Re: too bad convergence
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Thanks for your response, I've already seen it but it doesn't correspond to my problem. In my case, Pressure equation is inviscid, and it doesn't converge ( nor diverge )even for very smooth stretch.
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